Hono is a tall, plump, and healthy student at 170cm. With her stunning beauty and figure, she seems happy at first glance, but she struggles daily with the pressure of club activities, the expectations of her family, and a loneliness she can't tell anyone about, as she is jostled on the same crowded train every morning. It was Nakata, an unremarkable middle-aged man who stood almost hidden in the crowd, who noticed her long limbs. Nothing in particular happened. It was just that every time he saw her bare legs, every time he smelled her youthful, fragrant scent, his heart stirred and his groin swelled—a faint, ulterior motive of a middle-aged man. One morning, in the crowded train car that felt like it was going to crush him, Nakata approached Hono. His fingertips accidentally touched her skin due to a sudden, strong jolt. It was an unintentional act of molestation. The more he touched her, the more he couldn't pull away; his middle-aged desires exploded at her perfect body, and he finally crossed the forbidden line, thinking, "Whatever happens, happens..." At that moment, the pleasure switch deep inside the girl was flipped──. In the anonymous space of a train, they become dependent on each other, filling the void of their loneliness. A girl tired of constantly pretending to be strong, and a middle-aged man with nowhere to go in life. The more they engage in sexual acts, the more they crave each other and the more they can't separate. The dangerous final destination for these two is finally...